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  <title>预定义常量</title>

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</div><hr /><div id="apd.constants" class="appendix">
 <h1>预定义常量</h1>

 <p class="simpara">下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。</p>
  <table class="doctable table">
   <caption><strong>APD constants</strong></caption>
   
    <thead>
     <tr>
      <th>Constant</th>
      <th>Value</th>
      <th>Description</th>
     </tr>

    </thead>

    <tbody class="tbody">
     <tr id="constant.function-trace">
      <td>
       <strong><code>FUNCTION_TRACE</code></strong>
       (<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
      </td>
      <td>1</td>
      <td class="empty">&nbsp;</td>
     </tr>

     <tr id="constant.args-trace">
      <td>
       <strong><code>ARGS_TRACE</code></strong>
       (<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
      </td>
      <td>2</td>
      <td class="empty">&nbsp;</td>
     </tr>

     <tr id="constant.assignment-trace">
      <td>
       <strong><code>ASSIGNMENT_TRACE</code></strong>
       (<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
      </td>
      <td>4</td>
      <td class="empty">&nbsp;</td>
     </tr>

     <tr id="constant.statement-trace">
      <td>
       <strong><code>STATEMENT_TRACE</code></strong>
       (<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
      </td>
      <td>8</td>
      <td class="empty">&nbsp;</td>
     </tr>

     <tr id="constant.memory-trace">
      <td>
       <strong><code>MEMORY_TRACE</code></strong>
       (<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
      </td>
      <td>16</td>
      <td class="empty">&nbsp;</td>
     </tr>

     <tr id="constant.timing-trace">
      <td>
       <strong><code>TIMING_TRACE</code></strong>
       (<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
      </td>
      <td>32</td>
      <td class="empty">&nbsp;</td>
     </tr>

     <tr id="constant.summary-trace">
      <td>
       <strong><code>SUMMARY_TRACE</code></strong>
       (<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
      </td>
      <td>64</td>
      <td class="empty">&nbsp;</td>
     </tr>

     <tr id="constant.error-trace">
      <td>
       <strong><code>ERROR_TRACE</code></strong>
       (<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
      </td>
      <td>128</td>
      <td class="empty">&nbsp;</td>
     </tr>

     <tr id="constant.prof-trace">
      <td>
       <strong><code>PROF_TRACE</code></strong>
       (<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
      </td>
      <td>256</td>
      <td class="empty">&nbsp;</td>
     </tr>

     <tr id="constant.apd-version">
      <td>
       <strong><code>APD_VERSION</code></strong>
       (<span class="type"><a href="language.types.string.html" class="type string">string</a></span>)
      </td>
      <td>example: <em>1.0.2-dev</em></td>
      <td class="empty">&nbsp;</td>
     </tr>

    </tbody>
   
  </table>

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